Shading by Velocity?

Fluid Dynamics for LightWave 3D
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Joined: 15 Mar 2011, 00:41

Shading by Velocity?

Postby NovySan » 15 Mar 2011, 00:47

I'd like to shade the fire channel by velocity with red and green vectors that can then be used as a input to a vector blur to create a "heat distortion" effect. Can this be done with the current build?

Dan Novy
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Flash Film Works

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Re: Shading by Velocity?

Postby jascha » 22 Mar 2011, 13:51

Such 2D vectors cannot be rendered yet. Using the temperature field with a for heat distortion works great though (see attached movies - tutorial is in the works). This may even be preferable to using the velocity because it renders faster and the results look equally plausible. Yet, rendering average motion vectors for such post-effects may still make it into one of the next updates.

[ Play Quicktime file ] [ 1.3 MiB | Viewed 1461 times ]

[ Play Quicktime file ] [ 1.76 MiB | Viewed 1461 times ]


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Re: Shading by Velocity?

Postby daryn » 31 Jul 2016, 01:19

How do you actually use the temperature field for heat distortion?
Do you have any step by step instructions on this or an example file?

Thanks :)

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Re: Shading by Velocity?

Postby paulselhi » 03 Aug 2016, 09:14

render out a temp pass and use that in post as a distortion.
Fundamentals OF TurbulenceFD In Cinema 4D - Over 13 Hours of Tutorials and Projects Available Now

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Re: Shading by Velocity?

Postby Ipeleng » 27 Oct 2017, 06:39

Could you share the Project file for the video you have.
As I would like to know how to get the colour shading right

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